My teeth are oddball. I mean, they're straight and good and all, but they're more an adaptive set. I mean, it's like the more awake I am, or depending on what I'm eating, my teeth will adapt for it. Heck, there's even a visible difference to them when at work (eating something, compared to not eating).
Like just after eating something, my teeth are much whiter and dense, and can just about eat through anything (or so they feel), and my gums become rather tough as well. This seems more relevant when eating any meat that still has the bone with them. A more interesting case involving chicken soup cooked with parts of a whole chicken or beef stew. I don't know, maybe I'm just a full blown carnivore, because my teeth are rather crappy on their own (I have a crown on a near-disintegrated molar, I was hoping a wisdom tooth would replace; I got it, just the wrong spot in my mouth; no pain surprisingly, so no removal necessary, thank God.). If I'm eating something sweet, they yellow up a bit, and show little signs of weakness (more like sensitivity), after brushing my teeth, not much difference any which way. The oddest thing is that without whiteners or much brushing at all, my teeth get ridiculously white after a meal, not so much after brushing. o_O
Add to the strangeness, I haven't committed to fully brushing my teeth for a significant amount of time. I do a clean brushing (no toothpaste, just a rinse brushing) and the only place that shows any wear or bleeding is where my crown is. In any other case, just the base foundation shows some little holes, but they change sizes. I think as long as I'm providing a source of calcium, and not interfering with the process, my teeth are surprisingly doing fine sans brushing. Then again, I also drink tons of water too, so that could also probably be a factor.